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Colloquium

This series covers all areas of research at Perimeter Institute, as well as those outside of PI's scope.

Seminar Series Events/Videos

Currently there are no upcoming talks in this series.

 

Mercredi jan 16, 2013
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Gravity
in string theory is a generalized version of Einstein's theory with some 
universal features that call for a reformulation

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Mercredi déc 12, 2012

The Rosenbluth Method is a classical kinetic growth Monte
Carlo algorithm for growing a self-avoiding walk by appending steps to its
endpoint.

This algorithm

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Mercredi nov 28, 2012
Speaker(s): 

A revolution is underway in the construction of ‘artificial atoms’ out
of superconducting electrical circuits. 
These macroscopic ‘atoms’ have quantized energy levels and can emit and
absorb quanta of light (in this case microwave photons), just like ordinary
atoms.  Unlike ‘real’ atoms, the
properties of these artificial atoms can be engineered to suit various
particular applications, and they can be connected together by wires to form
quantum ‘computer chips.’  This so-called

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Mercredi nov 21, 2012
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Mercredi nov 14, 2012
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The solutions to
the cosmological constant problems may involve modifying the very long-range
dynamics of gravity by adding new degrees of freedom.  As an example of a conservative and minimal
such modification, we consider the possibility that the graviton has a very
small mass.  Massive gravity has received
renewed interest due to recent advances which have resolved its traditional
problems.  This kind of modification has
some peculiar and unexpected features, and it points us towards a universe
which looks quite unfamiliar.

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Mercredi nov 07, 2012
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A quantum communication channel can be put to many uses: it can transmit
classical information, private classical information, or quantum information.
It can be used alone, with shared entanglement, or together with other
channels. For each of these settings there is a capacity that quantifies a
channel's fundamental potential for communication.  In this introductory
talk, I will discuss what we known about the various capacities of a quantum
channel, including a discussion of synergies between different channels and

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Mercredi oct 24, 2012
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Some recent searches for quantum gravity signatures using
observations of distant astrophysical sources will be discussed, focusing on
the search for Lorentz invariance violation (LIV) in the form of a dependence
of the photon propagation speed on its energy. Fermi gamma-ray space telescope
observations of ~8 keV to ~30 GeV photons from a short ( burst (GRB 090510) at a cosmological distance (z = 0.903), enabled for the
first time to put a direct time of flight limit on a possible linear variation of

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Mercredi oct 17, 2012
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Astronomical hydrodynamics is usually almost ideal in the sense that the Reynolds number (Re) is enormous and any effective viscosity must be due to shocks or turbulence.  Astronomical magnetohydrodynamics (MHD) is often also nearly ideal, so that magnetic fields and plasma are well coupled.  In particular, dissipation of orbital energy in accretion disks around black holes is readily explained by MHD turbulence.  On the other hand, the planet-bearing disks around protostars are magnetically far from ideal because of very low fractional ionization.  MHD turbulence is at best marginal

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Mercredi oct 10, 2012
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Mercredi sep 26, 2012
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We review recent breakthroughs in understanding
some general features of the Renormalization Group and of Quantum Field Theory.
We discuss some applications of these new results and their deep connection to
the entanglement of the Quantum Field Theory vacuum.

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